A group of state attorneys general urged a federal judge on Tuesday to hold Microsoft to a 2002 antitrust settlement another five years so that the company can't stymie embryonic Web 2.0 rivals of its Windows operating system. According to six states - California, Connecticut, Iowa, Kansas, Minnesota and Massachusetts - and the District of Columbia, Microsoft could use its Internet Explorer browser as a 'chokepoint' to block moves that might unseat Windows dominant position on the desktop.